# US 5,723,084 A · Flash spinning process

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- Number: US 5,723,084 A
- Document ID: US5723084A
- Status: Granted
- Kind: A
- Application number: 08/612,713
- Filed: 1996-03-08
- Granted: 1998-03-03
- Earliest claimed: 1996-03-08
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Hyunkook Shin
- Web page: https://patentgrep.com/patent/US5723084A

## CPC

- C08J 9/142: {Compounds containing oxygen but no halogen atom}
- C08J 9/143: {Halogen containing compounds}
- D01D 5/11: Flash-spinning
- D01F 6/30: comprising olefins as the major constituent
- C08J 2373/02: Polyanhydrides
- Y10T 428/24826: Spot bonds connect components
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 442/608: Including strand or fiber material which is of specific structural definition
- Y10T 442/681: Spun-bonded nonwoven fabric
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Olefin/carbon monoxide alternating polymers are flash-spun to form plexifilamentary products, pulp products, and foam products from alcohol or halogenated hydrocarbon solvents having 1 to 3 carbon atoms.

## Claims

### Claim 1

A process for the production of flash-spun plexifilamentary film-fibril strands of a high molecular weight alternating copolymer of ethylene and carbon monoxide or a high molecular weight alternating copolymer having alternating polymerized units of carbon monoxide and at least two different olefin units one of which is ethylene, and the remainder are selected from the group consisting of propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, styrene, methyl acrylate, methyl methacrylate, vinyl acetate, undecenoic acid, undecenol, 6-chlorohexene, N-vinylpyrrolidone, and the diesters of vinylphosphonic acid in which a majority of the olefin units are ethylene units which comprises forming a spin solution of said alternating copolymer in a solvent having an atmospheric boiling point between 0.degree. C. and 210.degree. C., and selected from the group consisting of alcohols and halogenated hydrocarbons having 1 to 3 carbon atoms and spinning said spin solution at a pressure that is greater than the autogenous pressure of the spin solution into a region of substantially lower pressure and at a temperature at least 50.degree. C. higher than the atmospheric boiling point of the solvent to form plexifilamentary film-fibril strands of said alternating copolymer.

### Claim 2 (depends on 1)

The process of claim 1 in which the alcohol is selected from the group consisting of n-pentafluoropropanol, trifluoroethanol, 2,2,3,3,-tetrafluoro-1-propanol, hexafluoroisopropanol, heptafluoro-1-butanol, cyclohexanol, 1-methyl cyclohexanol, cis-2-methylcyclohexanol, trans-2-methylcyclohexanol, cis-3-methylcyclohexanol, trans-3-methylcyclohexanol, benzyl alcohol, phenol, and m-cresol.

### Claim 3 (depends on 1)

The process of claim 1 in which the alcohol is selected from the group consisting of n-pentafluoropropanol, trifluoroethanol, 2,2,3,3,-tetrafluoro-1-propanol, hexafluoroisopropanol, and heptafluoro-1-butanol.

### Claim 4 (depends on 1)

The process of claim 1 in which the alcohol is selected from the group consisting of cyclohexanol, 1-methyl cyclohexanol, cis-2-methylcyclohexanol, trans-2-methylcyclohexanol, cis-3-methylcyclohexanol, trans-3-methylcyclohexanol, benzyl alcohol, phenol, and m-cresol.

### Claim 5 (depends on 1)

The process of claim 1 in which the spin solution contains more than one of the alcohols selected from the group consisting of n-pentafluoropropanol, trifluoroethanol, 2,2,3,3,-tetrafluoro-1-propanol, hexafluoroisopropanol, heptafluoro-1-butanol, cyclohexanol, 1-methyl cyclohexanol, cis-2-methylcyclohexanol, trans-2-methylcyclohexanol, cis-3-methylcyclohexanol, trans-3-methylcyclohexanol, benzyl alcohol, phenol and m-cresol.

### Claim 6 (depends on 1)

The process of claim 1 in which the alcohol is n-pentafluoropropanol.

### Claim 7 (depends on 1)

The process of claim 1 where the alternating copolymer consists of polymerized ethylene units and carbon monoxide units.

### Claim 8 (depends on 1)

The process of claim 1 in which the atmospheric boiling point of the solvent is between 0.degree. and 100.degree. C.

### Claim 9 (depends on 1)

The process of claim 1 in which the solution is spun at a temperature between 200.degree. C. and 300.degree. C. and at a pressure of greater than 500 psig.

### Claim 10 (depends on 1)

The process of claim 1 wherein the solvent is methylene chloride.